So you end up with a bunch of commits in a random order relating to different things.
Lets say person A and person B are working on two features both committing to master.
Person A commits some work to master and pushes to origin. Person B commits some work and pushes to origin. Repeat this a few times, now you want to scrap the feature person A is working on. How do you cleanly handle this?
So, the answer would be to never scrap features (that's why you did proper design beforehand, right?).
That said, it seems you are suggesting that the workflow should be centered around rolling back features rather than commits? That being the case, if your feature spans multiple commits, then indeed you have something there. If your feature does not, branching probably isn't needed.
Lets say person A and person B are working on two features both committing to master.
Person A commits some work to master and pushes to origin. Person B commits some work and pushes to origin. Repeat this a few times, now you want to scrap the feature person A is working on. How do you cleanly handle this?